波导元件用空心金属波导或空腔等制作的微波电路的基本功能部件。波导元件可以组成各种波导网络或连成各种微波电路，其作用与低频下的电阻、电感、电容和谐振回路等很相似，但大都是分布参数元件。通常波导只起传输微波信号或功率的作用，而波导元件则能控制所传输的微波信号或功率，完成波型变换、阻抗调配、频率分隔或功率分配等各种功能。
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本文中提出了一种基于对称性算子综合波导元件的新方法。
A new method for synthesis of waveguide devices on the basis of symmetry operators is presented.
波导同轴旋转铰链是由矩形波导同轴波导构成，是雷达系统中的关键元件。
The waveguide-coaxial rotary joint consists of the rectangular waveguide and the coaxial waveguide, is one of the key components in the radar system.
特别是波导型光栅结构的导模共振现象被提出及广泛关注以后，这类光学元件就越发受到各国研究人员的青睐。
Especially, after guided-mode resonance in waveguide grating was presented and studied more detailed, this kind of optical elements has attracted a large of researchers.
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